MAS3504D datasheet(13/40 Pages) MICRONAS

13 / 40 page

MAS 3504D

Micronas

3.2. Command Structure

The I2C control of the MAS 3504D is done completely

via the I2C data register by using a special command

syntax.

The

commands

are

executed

the

MAS 3504D during its normal operation without any

loss or interruption of the incoming data or outgoing

audio data stream. These I2C commands allow the

controller to access internal states, RAM contents,

internal hardware control registers, and to download

software modules. The command structure allows

sophisticated control of the MAS 3504D. The registers

of the MAS 3504D are either general purpose, e.g. for

program flow control, or specialized registers that

directly affect hardware blocks. The unrestricted

access to these registers allows the system controller

to overrule the firmware configuration.

The MAS 3504D firmware scans the I2C interface peri-

odically and checks for pending or new commands.

Table 3–4 on page 13 shows the basic controller com-

mands that are available by the MAS 3504D.

3.2.1. Conventions for the Command Description

The description of the various controller commands

uses the following formalism:

– A data value is split into 4-bit nibbles which are

numbered beginning with 0 for the least significant

nibble.

– Data values in nibbles are always shown in hexa-

decimal notation indicated by a preceding $.

– A hexadecimal 20-bit number d is written, e.g. as

d = $17C63, its five nibbles are

d0 = $3, d1 = $6, d2 = $C, d3 = $7, and d4 = $1.

– Abbreviations used in the following descriptions:

address

data value

count value

offset value

don’t care

– Variables used in the following descriptions:

dev_write

$3A

dev_read

$3B

data_write

$68

data_read

$69

Table 3–4: Basic Controller Commands

Code

[hex]

Command

Comment

run

Start execution of an internal program. (Run 0 means freeze operating sys-

tem.)

write register

An internal register of the MAS 3504D can be written directly to by the con-

troller.

write to memory

A block of the DSP memory can be written to by the controller. This feature

may be used to download alternate programs.

read register

The controller can read an internal register of the MAS 3504D.

read memory

A block of the DSP memory can be read by the controller.

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